Use Realtemp 3.7(i think the version is right). It is a rar/zip file. Launch realtemp.exe and click on settings. There is an option for alarm for cpu and gpu. Select the temp u want and save it. You are done. It will alarm u when ur cpu/gpu exceeds the given temperature.
i came across that software even before posting this thread. but sadly that s/w is for intel based pc only. When i tried to use it, it said, incompatible cpu.
As your mobo is Gigabyte. A Gigabyte utility Easy Tune has the option for temperature exceed waning. Maybe that could help you..
will try it out now.
@techiemaharaj : good info. i have been using this motherboard for over two years but never tried that easytune utility..
But it has got the alarm feature only for cpu temperature